/*
 * Encog(tm) Core v3.2 - Java Version
 * http://www.heatonresearch.com/encog/
 * https://github.com/encog/encog-java-core
 
 * Copyright 2008-2013 Heaton Research, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *   
 * For more information on Heaton Research copyrights, licenses 
 * and trademarks visit:
 * http://www.heatonresearch.com/copyright
 */
package org.encog.util.kmeans;

/**
 * A centroid.
 */
public interface Centroid<O>
{    
	/**
	 * Add an element to the centroid.
	 * @param e The element to add.
	 */
    public void add(O e);
    
    /**
     * Remove an element from the centroid.
     * @param o The element to remove.
     */
    public void remove(O o);
    
    /**
     * The distance between this centroid and an element.
     * @param o The element.
     * @return The distance.
     */
    public double distance(O o);
}
